Thats the problem. First I suposse it was maybe by a bad low idling tuning, but riching or leaning the problem remains, 'cause rich or lean the throttle go off so slowly when I turn it, same from low speeds that high speeds, the throttle it's seems stuck.

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"Never mind the track. The track is for punks. We are Road People. We are Café Racers." Hunter S. Thompson-------------------------------Café Racer CB400SS Royal Enfield Bullet 500ES-------------------------------

Thats the problem. First I suposse it was maybe by a bad low idling tuning, but riching or leaning the problem remains, 'cause rich or lean the throttle go off so slowly when I turn it, same from low speeds that high speeds, the throttle it's seems stuck.

Loosen the clamps on the carb rubber boots after removing the air cleaner assembly.

Gently turn the the carb where the throttle cable entering the slide cap is facing more toward you.

Unscrew the carb slide cap and gently pull the slide out.

Check for hardened cosmoline grease on the slide - clean it off with kerosene.

Have a buddy pull on the slide and holding the cap, while you work the throttle, and check for any cable binding in the full range of mechanical travel.

If binding or roughness occurs, take off the cable at the slide cap and check for casting flash right in that area. Will need a tiny model makers file to remove any casting imperfections. Chances are this is where the binding will occur.

The exact same problem I had on my bike. After fiddling with it for a long time - my dealer found the casting flash which slipped by me...

Another common problem is the tank may be pinching the cable. Make sure the cable is free under the tank. Sometimes I have to loosen the carb and tilt it slightly to the left to keep the cable from rubbing or binding on the inner edge of the tank. And, as has been mentioned, check the intake hose. you should also check the manifold mount at the cylinder head.

With the engine off, open the throttle with the twist-grip and then release it. See if you can hear the throttle slide falling back with a little "clunk". If you can't hear this, the throttle slide or cable may be sticking. If you can hear it, then the problem is not the throttle slide or cable and may be an air-leak.

Check. The throttle cable was sticking between the spine of the frame and the tank. Totally clipped at 3 or 4 cm to the carb-trottle calbe rubber cap.Now the throttle is free and (after tune the carb) the bike is so smoooth and it's response normally at gas.Thanks to all

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"Never mind the track. The track is for punks. We are Road People. We are Café Racers." Hunter S. Thompson-------------------------------Café Racer CB400SS Royal Enfield Bullet 500ES-------------------------------